Here is an example of how to use the PathFileComparator class from the org.apache.commons.io package in Java:

import java.io.File;
import org.apache.commons.io.comparator.PathFileComparator;

public class Example {
    public static void main(String[] args) {
        File[] files = ...
        Arrays.sort(files, PathFileComparator.PATH_COMPARATOR);
    }
}

In this example, we are sorting an array of File objects using the PathFileComparator.PATH_COMPARATOR constant. This comparator sorts files based on their paths. The Arrays.sort() method is used to sort the files array using the PathFileComparator.PATH_COMPARATOR constant as the comparator.

You can also pass a boolean value as argument to the PathFileComparator constructor indicating whether the sort should be done in reverse order. For example:

PathFileComparator comparator = new PathFileComparator(true);

This will sort the files in reverse order of their paths.

It's worth noting that the PathFileComparator class is an extension of AbstractFileComparator class, that uses the File class's natural ordering to compares files and sorts them based on their paths, in the order specified in the constructor.